Wisconsin Sen. Ron Johnson, shown in this Jan. 6, 2014, photo, placed 29th on the list of the wealthiest lawmakers in Congress last year compiled by Roll Call.

Written by

Donovan Slack |
Gannett Washington Bureau

Wisconsin Sen. Ron Johnson is sure to land on the list of Congress's most wealthy lawmakers once again this year.

His assets are valued at between $13.5 million and $38.7 million, according to new financial disclosure reports. That's up slightly from last year when the Oshkosh Republican reported a minimum worth of $12.5 million.

The gains are due mostly to an increase in value of his and his wife's commercial real estate, which went from $4.3 million in 2012 to at least $5 million in 2013, according to the disclosure report filed Thursday. ...